Andy Murray continues to flit back and forth between hard courts and clay as the world No 2 practised for the first time at The O2 on Friday evening.

After four days of training on a clay court at London's Queen's Club with the Davis Cup final against Belgium in mind, Murray is now turning his attention to the ATP World Tour Finals, in which he gets his campaign under way on Monday.

Murray requested a later start to allow him more time to prepare and his wish was granted with his opening round-robin match against Spaniard David Ferrer being scheduled for the second day of the tournament.

Andy Murray hits a forehand as he takes part in his first practice session at The O2 on Friday evening

Murray sits down for a drink as his support team look on at The O2 ahead of the ATP World Tour Finals

Despite this hectic month and his unconventional preparation for the ATP's end-of-season finale, Murray believes that he can lift the trophy for the first time next Sunday.

Murray said: 'I think definitely I have a chance to win here. I do think that I have to be a bit realistic in the first few days.

'I have just switched surfaces and balls and now I will be going back again and I might not be timing the ball perfectly at the beginning of the week but as it goes on hopefully I will start to play better tennis.

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'I do feel I have an opportunity here. I think the conditions in Paris are fairly similar to here, so it will be interesting to see how I get on. But I do think I am playing well enough to go far.

'This week the preparations have been tricky, obviously, with the preparation being mainly on the clay but it was never going to be perfect. But it is also a good situation to be in.

'I would have signed up to be in this situation at the end of the year in comparison to last year and hopefully I can play some good tennis here and in the Davis Cup.'

Murray has been hitting on clay all this week at the Queen's Club before switching back to hard

Murray's coach Jonas Bjorkman looks on from the back of the court on Friday evening

Rafael Nadal told Sportsmail this week that he felt it was unfair that the World Tour Finals are always played on hard court, suggesting that an indoor clay court could be laid at The O2.

Clay in North Greenwich would certainly have suited Murray this year and he did not disagree with Nadal's point on a change of surface, even going as far as mentioning the possibility of the tournament being played on grass.

Murray said: 'I’m certainly not against that. Changing the surface up isn’t a bad idea.

'I don’t know what all of the other players think but also varying the speed of the court for the year-end championships would be a good thing, providing the players are allowed to get on the court early enough to prepare properly on it.

'I’m not against changing the surface just so it’s something different for all of the players. I wouldn’t mind seeing it on a grass court.

Murray gives a smile as he prepares for his opening match at The O2 against David Ferrer on Monday

GROUP STAN SMITH

Novak Djokovic

Roger Federer

Tomas Berdych

Kei Nishikori

GROUP ILIE NASTASE

Andy Murray

Stan Wawrinka

Rafael Nadal

David Ferrer

'I know it would be difficult to get an indoor grass court. I don’t know how Wimbledon would feel about that, but I’m not against that.'

Murray returns to The O2 for his first competitive match here since he was thrashed 6-0, 6-1 in just 56 minutes by Roger Federer last year, but he bristled at the suggestion he had demons to exorcise.

Murray said: 'I don't feel I have to prove anything to anyone. It was obviously a tough way for me to finish the year last year but I gained something positive from it.

'I feel like I went away and worked extremely hard on my game and came back and had the most consistent year of my life. I don't feel that that match affected me in a negative way at all.'

World No 2 Murray speaks to the media during a press conference earlier on Friday afternoon

Murray is joined at the World Tour Finals this year by older brother Jamie, who has qualified for the first time with Australian partner John Peers in the doubles.

Murray said: 'Jamie has obviously had an amazing year. I am very proud of him and what he has achieved on the court. I think for both of us to be here - It is really nice and I am very proud we have managed to do that.

'I was hoping that we would be able to have one session where he was playing the doubles and I was playing the singles but we are playing on different days unfortunately. I hope he has a good week.'